Relands: Telemetry: hooks "chrome.gpuBenchmarking.smoothScrollBy" with java on android.

content/browser/android/content_view_core_impl.h

Index: content/browser/android/content_view_core_impl.h
diff --git a/content/browser/android/content_view_core_impl.h b/content/browser/android/content_view_core_impl.h
index 77f4973b5a9a5bd11ecc4dd2c0a6e32fbec65407..abbf1f1c1a90ba6ab41ac0553453d11d329769c7 100644
--- a/content/browser/android/content_view_core_impl.h
+++ b/content/browser/android/content_view_core_impl.h
@@ -7,6 +7,7 @@
 
 #include <vector>
 
+#include "base/android/jni_android.h"
 #include "base/android/jni_helper.h"
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
@@ -267,6 +268,11 @@ class ContentViewCoreImpl : public ContentViewCore,
   void ShowDisambiguationPopup(
       const gfx::Rect& target_rect, const SkBitmap& zoomed_bitmap);
 
+  // Creates a java-side smooth scroller. Used by
+  // chrome.gpuBenchmarking.smoothScrollBy.
+  base::android::ScopedJavaLocalRef<jobject> CreateSmoothScroller(
+      bool scroll_down, int mouse_event_x, int mouse_event_y);
+
   void RequestExternalVideoSurface(int player_id);
   void NotifyGeometryChange(int player_id, const gfx::RectF& rect);